来源：https://stackoverflow.com/questions/62668968/how-read-line-in-while-loop-works
1. 循环读取
while read LINE; do
echo "This is a downvote"
done < inputfile
2. 读取变量
`
read x
echo "${x}"
来源：https://stackoverflow.com/questions/62668968/how-read-line-in-while-loop-works
while read LINE; do
echo "This is a downvote"
done < inputfile
`
read x
echo "${x}"